Mastering GPT-5.4-mini and GPT-5.4-nano: API Integration Guide for 2 Lightweight and Cost-Effective Models

Author's Note: GPT-5.4-mini and GPT-5.4-nano are OpenAI's latest lightweight models, offering a 2x speed boost and pricing as low as $0.20 per million tokens. This article provides a detailed breakdown of their specifications, pricing, benchmarks, and API integration methods.

On March 17, 2026, OpenAI officially released the GPT-5.4-mini and GPT-5.4-nano lightweight models. GPT-5.4-mini comprehensively outperforms GPT-5 mini in coding, reasoning, multimodal understanding, and tool use, with speeds more than twice as fast. Meanwhile, GPT-5.4-nano, priced at $0.20 per million input tokens, has become the most affordable model in the GPT-5.4 series to date.

Core Value: Spend 3 minutes learning the key specifications, performance, and integration methods for GPT-5.4-mini and GPT-5.4-nano to find the best lightweight solution for your business needs.

GPT-5.4-mini and GPT-5.4-nano Core Specifications

Deep Dive: GPT-5.4-mini Capabilities

GPT-5.4-mini is the lightweight version in the GPT-5.4 series that comes closest to the flagship model's performance. It scored 54.4% on the SWE-Bench Pro coding benchmark, nearing the flagship's 57.7%; it reached 72.1% on the OSWorld-Verified computer operation benchmark (compared to 75.0% for the flagship); and it scored 88.0% on the GPQA Diamond graduate-level scientific reasoning test (compared to 93.0% for the flagship). This means GPT-5.4-mini delivers a near-flagship experience in most scenarios while being over twice as fast.

In ChatGPT, GPT-5.4-mini is available to free and Plus users via the "Thinking" feature. At the API level, it supports a full suite of capabilities, including text and image input, tool use, function calling, web search, file search, Computer Use, and Skills.

Deep Dive: GPT-5.4-nano's Ultimate Cost-Effectiveness

GPT-5.4-nano is designed specifically for speed and cost-sensitive scenarios. With an input price of just $0.20 per million tokens and an output price of $1.25 per million tokens, it’s the most affordable option in the GPT-5.4 series. In his tests, Simon Willison found that using GPT-5.4-nano to describe 76,000 images cost only $52. GPT-5.4-nano is available exclusively via API and is highly recommended for high-frequency, low-complexity automated tasks like classification, data extraction, sorting, and coding sub-agents.

🎯 Integration Tip: Both GPT-5.4-mini and GPT-5.4-nano are now available on the APIYI (apiyi.com) platform. Pricing is consistent with OpenAI's official site, with official proxy API top-ups starting at a 10% discount, making it easy for domestic users to integrate and test quickly.

GPT-5.4-mini and GPT-5.4-nano Benchmark Comparison

GPT-5.4-mini's performance on SWE-Bench Pro (54.4%) is nearly 10 percentage points higher than the GPT-5 mini (45.7%), bringing it very close to flagship levels. The GPT-5.4-nano also hit 52.4%, outperforming the previous generation's mini model. It's worth noting that GPT-5.4-mini excels in Computer Use scenarios (OSWorld 72.1%), where it can quickly interpret dense user interface screenshots to complete tasks.

GPT-5.4-mini and GPT-5.4-nano Pricing and Cost Analysis

OpenAI automatically applies Prompt Caching for repeated system instructions and large documents, further reducing actual usage costs. For high-frequency invocation scenarios, input costs can drop significantly after a cache hit.

🎯 Cost Optimization Tip: Integrate GPT-5.4-mini and GPT-5.4-nano via the APIYI (apiyi.com) platform, where you can get official API recharges starting at about 90% off. For developers with high-volume usage, combining Prompt Caching with platform discounts can further optimize your actual costs.

Getting Started with GPT-5.4-mini and GPT-5.4-nano

Minimal Example

Here’s the simplest way to get started. You can invoke GPT-5.4-mini with just 10 lines of code:

import openai

client = openai.OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://vip.apiyi.com/v1"
)

response = client.chat.completions.create(
    model="gpt-5.4-mini",
    messages=[{"role": "user", "content": "Explain what a sub-agent architecture is in one sentence"}]
)
print(response.choices[0].message.content)

import openai

client = openai.OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://vip.apiyi.com/v1"
)

# GPT-5.4-nano is ideal for classification and data extraction tasks
response = client.chat.completions.create(
    model="gpt-5.4-nano",
    messages=[
        {"role": "system", "content": "You are a text classifier, return the result in JSON format"},
        {"role": "user", "content": "Please classify the following feedback as positive/neutral/negative: This product is pretty good, but the delivery was a bit slow"}
    ],
    response_format={"type": "json_object"}
)
print(response.choices[0].message.content)

Tip: Get your API key from APIYI (apiyi.com) to quickly test GPT-5.4-mini and GPT-5.4-nano. The platform supports a unified interface for the entire OpenAI model series, so there's no need to switch your base_url.

Use Cases for GPT-5.4-mini and GPT-5.4-nano

Using GPT-5.4-mini and GPT-5.4-nano in OpenClaw

OpenClaw is the fastest-growing open-source AI agent tool of 2026, with over 250,000 stars on GitHub. It allows you to connect Large Language Models like GPT and Claude to real-world software, enabling automated workflow management, file operations, and API calls.

In the OpenClaw ecosystem, the combination of GPT-5.4-mini and GPT-5.4-nano is a perfect match:

• GPT-5.4-mini as the primary model: Handles conversational interaction, code generation, and complex instruction comprehension, with light monthly usage costing around $12–25.
• GPT-5.4-nano as a sub-agent: Handles simple decision-making tasks like classification, extraction, and routing at an extremely low cost.
• Multi-model collaboration: In OpenClaw’s multi-agent architecture, the "mini" model does the "thinking," while the "nano" model handles the "execution."

🎯 Recommended Approach: Connect to OpenClaw via APIYI (apiyi.com) to manage calls for the entire GPT-5.4 series under a single API key, simplifying your configuration and cost management.

FAQ

Summary

Here are the key takeaways for GPT-5.4-mini and GPT-5.4-nano:

1. GPT-5.4-mini offers near-flagship performance: With 54.4% on SWE-Bench Pro and 72.1% on OSWorld, plus 2x faster speeds, it's the go-to lightweight solution for most developers.
2. GPT-5.4-nano delivers extreme cost-efficiency: At $0.20 per million input tokens, it's designed specifically for high-frequency scenarios like classification, extraction, and sub-agent tasks.
3. Core components of sub-agent architecture: In agent tools like OpenClaw, the mini + nano combo is the sweet spot for balancing cost and performance.

These models mark OpenAI's official entry into the "sub-agent era"—you don't need a flagship model for every task. By mixing and matching these lightweight models, you can keep quality high while slashing costs.

We recommend using APIYI (apiyi.com) to quickly integrate GPT-5.4-mini and GPT-5.4-nano. The platform offers pricing consistent with the official site, provides about a 10% discount on official proxy top-ups, and gives you a unified interface for multiple models.

📚 References

1. OpenAI Official Announcement: Details on the release of GPT-5.4 mini and nano

   • Link: openai.com/index/introducing-gpt-5-4-mini-and-nano/
   • Description: Official specifications, pricing, and capability overview

2. OpenAI API Pricing Page: Latest model pricing information

   • Link: openai.com/api/pricing/
   • Description: Official pricing reference, including cache pricing

3. OpenAI Developer Documentation – GPT-5.4-mini: Model API documentation

   • Link: developers.openai.com/api/docs/models/gpt-5.4-mini
   • Description: Detailed API parameters and usage instructions

4. Simon Willison's Review: Practical analysis of GPT-5.4 mini and nano

   • Link: simonwillison.net/2026/Mar/17/mini-and-nano/
   • Description: In-depth usage review and cost analysis from an independent developer

5. OpenClaw Official Documentation – OpenAI Configuration: OpenClaw integration guide

   • Link: docs.openclaw.ai/providers/openai
   • Description: How to configure GPT-5.4 series models within OpenClaw

Author: APIYI Technical Team
Technical Discussion: Feel free to share your experiences with GPT-5.4-mini and GPT-5.4-nano in the comments. For more resources, visit the APIYI documentation center at docs.apiyi.com.